1// load fs
2const fs = require("fs");
3// read the file
4const content = fs.readFileSync("./my_file.txt");
5// print it
6console.log(content.toString());

1const fs = require("fs");
2
3// __dirname means relative to script. Use "./data.txt" if you want it relative to execution path.
4fs.readFile(__dirname + "/data.txt", (error, data) => {
5    if(error) {
6        throw error;
7    }
8    console.log(data.toString());
9});

1const fs = require('fs');
2
3fs.readFile('my-file.txt', 'utf8', function(err, data) {
4    if (err) throw err;
5    console.log(data);
6});

1fs = require('fs')
2fs.readFile('/etc/hosts', 'utf8', function (err,data) {
3  if (err) {
4    return console.log(err);
5  }
6  console.log(data);
7});